140378561 has 4 divisors (see below), whose sum is σ = 141484032. Its totient is φ = 139273092.

The previous prime is 140378551. The next prime is 140378599. The reversal of 140378561 is 165873041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165873041 = 1237 ⋅134093.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140378561 is a prime.

It is a super-2 number, since 2×140378561² = 39412280776861442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140378521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552545 + ... + 552798.

It is an arithmetic number, because the mean of its divisors is an integer number (35371008).

Almost surely, 2^140378561 is an apocalyptic number.

It is an amenable number.

140378561 is a deficient number, since it is larger than the sum of its proper divisors (1105471).

140378561 is a wasteful number, since it uses less digits than its factorization.

140378561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105470.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 140378561 is about 11848.1458887034. The cubic root of 140378561 is about 519.7170070143.

The spelling of 140378561 in words is "one hundred forty million, three hundred seventy-eight thousand, five hundred sixty-one".